Advertisements
Advertisements
Question
Advertisements
Solution
1 nm = 10 Å
APPEARS IN
RELATED QUESTIONS
Calculate the focal length of a corrective lens having power +2.5 D.
A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.
The focal length of a lens is +150 mm. What kind of lens is it and what is its power?
A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with one another.
(a) What is the power of this combination?
(b) What is the focal length of this combination?
(c) Is this combination converging or diverging?
How is the sign (+ or -) of power of a lens related to its divergent or convergent action?
Consider the situation described in the previous problem. Where should a point source be placed on the principal axis so that the two images form at the same place?
How is accommodation produced?
Complete the diagram to show the formation of the image of the object AB.

(i) Name the Lens LL’.
(ii) Where is the image of the object AB formed?
(iii) State three characteristics of the image.
Focal length : metre : : power of lens : _______
Find the power of a convex lens of focal length of + 25 cm.
